diff --git a/iscsi-scst/Makefile b/iscsi-scst/Makefile
index 6dda3422c..7ac41c95d 100644
--- a/iscsi-scst/Makefile
+++ b/iscsi-scst/Makefile
@@ -123,19 +123,21 @@ CONFTEST_OUTPUTS = $(shell			\
 		echo $$t/result-$(KVER).txt;	\
 	done)
 
-CONFTEST_CFLAGS = $(OFED_CFLAGS)			\
-	-DOFED_FLAVOR=$(OFED_FLAVOR)			\
+CONFTEST_CFLAGS =					\
 	$(shell for t in $(CONFTESTS); do 		\
 		cat $$t/result-$(KVER).txt 2>/dev/null; \
 	done)
 
+ISER_CFLAGS = $(OFED_CFLAGS) -DOFED_FLAVOR=$(OFED_FLAVOR) $(CONFTEST_CFLAGS)
+
 mods: include/iscsi_scst_itf_ver.h $(CONFTEST_OUTPUTS)
-	$(MAKE) -C $(KDIR) M=$(KMOD) CONFTEST_CFLAGS="$(CONFTEST_CFLAGS)" modules
+	$(MAKE) -C $(KDIR) M=$(KMOD) CONFTEST_CFLAGS="$(CONFTEST_CFLAGS)"\
+	  modules
 	echo "$@:  INFINIBAND_ENABLED = $(INFINIBAND_ENABLED)"
-	if $(INFINIBAND_ENABLED); then					       \
-	  echo "  Building against $(OFED_FLAVOR) RDMA kernel headers.";       \
-	  $(MAKE) -C $(KDIR) M=$(ISERTMOD) CONFTEST_CFLAGS="$(CONFTEST_CFLAGS)"\
-	  $(OFED_CONFIG) modules;					       \
+	if $(INFINIBAND_ENABLED); then					\
+	  echo "  Building against $(OFED_FLAVOR) RDMA kernel headers.";\
+	  $(MAKE) -C $(KDIR) M=$(ISERTMOD) ISER_CFLAGS="$(ISER_CFLAGS)"	\
+	  $(OFED_CONFIG) modules;					\
 	fi
 
 progs: include/iscsi_scst_itf_ver.h
diff --git a/iscsi-scst/kernel/Kbuild b/iscsi-scst/kernel/Kbuild
index 08feb06b1..c6d33400d 100644
--- a/iscsi-scst/kernel/Kbuild
+++ b/iscsi-scst/kernel/Kbuild
@@ -14,9 +14,7 @@
 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 #  GNU General Public License for more details.
 
-KBUILD_EXTRA_SYMBOLS = $(src)/../../scst/src/Module.symvers		       \
-		$(shell for d in /usr/src/ofa_kernel/default/Module.symvers; do\
-			[ -e $$d ] || continue; echo $$d; break; done)
+KBUILD_EXTRA_SYMBOLS = $(src)/../../scst/src/Module.symvers
 
 ccflags-y += -I$(src)/../include -I$(src)/../../scst/include
 ccflags-y += $(CONFTEST_CFLAGS)
diff --git a/iscsi-scst/kernel/isert-scst/Kbuild b/iscsi-scst/kernel/isert-scst/Kbuild
index 6d583711e..932a6bf87 100644
--- a/iscsi-scst/kernel/isert-scst/Kbuild
+++ b/iscsi-scst/kernel/isert-scst/Kbuild
@@ -14,7 +14,7 @@
 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 #  GNU General Public License for more details.
 
-LINUXINCLUDE := $(CONFTEST_CFLAGS) $(LINUXINCLUDE)
+LINUXINCLUDE := $(ISER_CFLAGS) $(LINUXINCLUDE)
 KBUILD_EXTRA_SYMBOLS=$(src)/../../kernel/Module.symvers			       \
 		$(shell for d in /usr/src/ofa_kernel/default/Module.symvers; do\
 			[ -e $$d ] || continue; echo $$d; break; done)
diff --git a/scst/include/backport.h b/scst/include/backport.h
index 5ec336841..abb90c6f5 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -2032,8 +2032,24 @@ enum {
 #define wwn_to_u64(wwn) get_unaligned_be64(wwn)
 #endif
 
+/*
+ * See also commit c39e0af64bce ("scsi: scsi_transport_fc: Add FPIN fc event
+ * codes") # v5.2
+ */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
+static inline void
+fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
+{
+}
+#endif
+
 /* <uapi/scsi/fc/fc_els.h> */
 
+/* See also commit a7dff3ad4787 ("scsi: fc: add FPIN ELS definition") # v5.2 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
+#define ELS_FPIN 0x16
+#endif
+
 /*
  * See also commit 62e9dd177732 ("scsi: qla2xxx: Change in PUREX to handle FPIN
  * ELS requests").